Isothermal process law: identify the governing gas law For an isothermal (constant-temperature) process of an ideal gas, select the correct law that applies. Choose the correct option.
Mechanical Engineering
Thermodynamics
Difficulty: Easy
Choose an option
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ABoyle's law
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BCharles' law
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CGay-Lussac law
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DAvogadro's law
Answer
Correct Answer: Boyle's law
Explanation
ConceptFor an isothermal process (T constant) of an ideal gas, the pressure–volume product remains constant: pV = constant. This is exactly Boyle's law.
Why the others are incorrectCharles' law is V ∝ T at constant p; Gay-Lussac's is p ∝ T at constant V; Avogadro's relates equal volumes to equal moles at the same T and p.
Final AnswerBoyle's law